Roton Ballscrew Lead error figures?

[davo727]

Hi, Im considering roton for my r45 clone mill conversion and noticed they dont have the lead accuracy listed on their website. Anyone know. Anyone used roton and had problems related to lead error. How about backlash related to roton ballnuts good or bad? I think I have a decent handle on what I need to do about end mount blocks and bearings due to the info provided here from NcCams and others so thanks very much to them for that. I called to check on Rockford screws but the local dealer hasnt gotten back with me. Another thing Rockford lists their lead error as .004 to .007. That seems like a lot to me. What do you all think. Also interested in Nook and NSK ballscrews. Thanks, Dave

[holbieone]

check and see if you can map the lead error in the controller

[RICHARD ZASTROW]

davo727, The lead error numbers in my Rockford catalog are .003-.007", about like you mentioned. Seems excessive to me also. However, these are rolled not ground ballscrews. Prices go up along with accuracy/precision. Seems like the decimal system, increase accuracy by one decimal place and the price multiplies by a factor of 10.

[davo727]

Hey Richard thanks for the reply. Im going to check prices on Nook ballscrews, they list their XPR precision rolled series at .001 max error per foot. I talked to a sales guy at Motion Ind here in houston yesterday and he was actually helpful and they are dealers for about 5 different ballscrew mfg along with a bunch of bearing companies. Dave

[Zumba]

Nook XPRs are great for mill conversions. Not nearly as expensive as ground screws. The nuts, on the otherhand, are the same ones they use on the ground screws, and are quite pricey.

[davo727]

I should be able to get pricing on nook on monday. I have a sales guy at Motion ind that actually wants to sell me parts , as opposed to most industrial reps that only want to sell to businesses. I will let you all know what I find out. I have one question for you guys- I have considered a few large diameter ballscrews off ebay for my z-axis but they have had a lead figure of .250 as opposed to the common .200 that most of the r45 or IH guys use. Is this usable or do I need to stick with the .200 pitch? Thanks, Dave